Battery pack case and method for manufacturing the same

Abstract

A battery pack case prevents moisture from being permeated into a battery pack with an easily assembled structure. The battery pack case includes an upper pack case and a lower pack case that are slidably coupled with each other. The upper pack case includes a coupling protrusion, and the lower pack case includes a coupling groove such that a bonding member is at portion at which the coupling protrusion and the coupling groove come into contact with each other.

What is claimed is: 
     
       1. A battery pack case to accommodate a battery pack in a sealed space within the battery pack case, comprising:
 an upper pack case and a lower pack case that are slidably coupled with each other with respect to a first horizontal direction parallel to a lower end of the upper pack case; 
 a coupling protrusion protruding from an entire periphery of the lower end of a lower frame on four side surfaces of the upper pack case, the four side surfaces of the upper pack case including right, left, front, and rear sides of the upper pack case; 
 a coupling groove corresponding to the coupling protrusion and defined in an entire end of a upper frame on four side surfaces of the lower pack case, the four side surfaces of the lower pack case including right, left, front, and rear sides of the lower pack case; and 
 a bonding member disposed on a portion at which the coupling protrusion and the coupling groove come into contact with each other and injected into the coupling groove, 
 wherein the lower pack case has an injection hole through which the bonding member is injected into an outer surface in which the coupling groove is defined, 
 wherein the coupling protrusion on each of the right and left sides of the upper pack case includes:
 a protrusion connection part protruding from the lower end of the upper pack case; and 
 a coupling part on a distal end of the protrusion connection part to protrude in a second horizontal direction perpendicular with the first horizontal direction such that a width of the protrusion connection part in the second horizontal direction perpendicular to the first horizontal direction is less than a width in the second direction of the coupling part, 
 
 wherein the coupling groove of the lower pack case includes a hook protrusion at each of the right and left sides of the lower pack case such that the hook protrusion is slidably coupled to the coupling protrusion such that the hook protrusion is over an upper surface of the coupling part with the coupling part being between the hook protrusion and the lower pack case, and 
 wherein the hook protrusion is absent at the front side of the lower pack case. 
 
     
     
       2. The battery pack case of  claim 1 , wherein the protrusion connection parts of the coupling protrusion disposed on the the right and left sides of the upper pack case have the same height. 
     
     
       3. The battery pack case of  claim 1 , wherein the coupling protrusion disposed on the right and left sides of the upper pack case have heights different from the coupling protrusion disposed on front and rear sides of the upper pack case. 
     
     
       4. The battery pack case of  claim 1 , wherein the bonding member is injected in a liquid phase when being injected and is cured after the injection. 
     
     
       5. The battery pack case of  claim 1 , wherein the coupling part is further provided at the rear side of the upper pack case, and wherein the hook protrusion is further provided at the rear side of the lower pack case rear to receive the coupling part of the rear side of the upper pack case when the upper pack case and the lower pack case are slidably coupled.